sync: Pool does not release memory on GC

[dvyukov]

Reported on golang-nuts:
https://groups.google.com/d/msg/golang-nuts/6vxv4xRPT38/bKzf1oM7v8cJ

sync.Pool does not release memory on GC

Introduced in:
https://code.google.com/p/go/source/detail?r=ad21d6ca5d82#

Marking as Release-Go1.3.4 so that we can decide later if we ever do 1.3.4.

[gopherbot]

Comment 1:

CL https://golang.org/cl/162980043 mentions this issue.

[dvyukov]

Comment 2:

This issue was closed by revision af3868f.

Status changed to Fixed.